You can put this solution on YOUR website! angles ABC is formed by the intersection of the lines y= x, y= -2x, y= -4
solve for triangle ABC
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y=-4 is blue line
y=-2x is green line
y=x is red line
Label vertices of triangle as follows:
Top A
Left B
Right C
Point of intersection on base D
AD=4
BD=4
DC=2
AC=sqrt(4^2+2^2)=√20=2√5
BC=4+2=6
AB=sqrt(4^2+4^2)=√32=4√2